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  <title>Document</title>
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<body>
  <script>
    //数组求和+求平均值
    // let arr = [2, 6, 1, 7, 4]
    // let sum = 0
    // for (let i = 0; i < arr.length; i++) {
    //   // console.log(arr[i]);
    //   sum = sum + arr[i]
    // }
    // document.write(sum)
    // document.write(sum / arr.length)
    //数组求最大值和最小值
    let max = 2
    let arr = [2, 6, 1, 77, 52, 25, 7]
    for (let i = 1; i < arr.length; i++) {
      if (max < arr[i]) {
        max = arr[i]
      }
    }
    document.write(max)



  </script>
</body>

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